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lodash merge vs object.assign vs spread with 3 objects fix
(version: 0)
Comparing performance of:
lodash merge vs object.assign vs spread
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Tests:
lodash merge
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var d = { g: 'was', h: 'yani'} var c = _.merge(a, b, d);
object.assign
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var d = { g: 'was', h: 'yani'} var c = Object.assign(a, b, d);
spread
var a = { a: 'oh', b: 'my' }; var b = { c: 'goddess' }; var d = { g: 'was', h: 'yani'} var c = { ...a, ...b, ...d };
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
lodash merge
object.assign
spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down what's being tested in the provided benchmark. **Benchmark Overview** The test compares three different methods for merging objects in JavaScript: 1. `lodash.merge` 2. `object.assign` 3. `spread operator` (using destructuring assignment) **Method 1: Lodash Merge** Lodash is a popular utility library that provides a variety of functions, including `merge`. In this case, the `merge` function is used to combine three objects (`a`, `b`, and `d`) into a single object. Pros: * Fast and efficient * Supports merging multiple objects with different properties Cons: * Requires an external library (Lodash) * Can be slower than native JavaScript alternatives for simple merge operations **Method 2: Object.assign** `Object.assign` is a built-in JavaScript function that copies properties from one or more source objects to a target object. In this case, it's used to merge the three input objects. Pros: * Fast and efficient * Built-in function, so no external library required * Supports merging multiple objects with different properties Cons: * Can be slower than Lodash for complex merges * Requires explicit looping or using `...` spread syntax, which can lead to errors if not used correctly **Method 3: Spread Operator** The spread operator (using the `...` syntax) is a modern JavaScript feature that allows you to merge objects by spreading their properties into a new object. In this case, it's used to merge the three input objects. Pros: * Fast and efficient * Built-in function (since JavaScript 2015) * Easy to read and write Cons: * Only available in modern browsers (Chrome 92 and above) that support ES6+ features * Can lead to errors if not used correctly (e.g., when dealing with non-objects or complex merges) **Library: Lodash** Lodash is a utility library for JavaScript that provides a variety of functions, including `merge`. It's widely used for its convenience and performance. However, it requires an external library inclusion, which might be a drawback for some projects. **Other Considerations** * Performance: All three methods have similar performance characteristics when dealing with simple merges. However, Lodash might be slower than native JavaScript alternatives due to the overhead of an external library. * Code Readability: The spread operator is generally considered more readable and concise than `Object.assign` or Lodash's `merge` function. * Browser Support: The spread operator requires modern browsers that support ES6+ features. If you need to support older browsers, you'll need to use a different approach. **Alternatives** If you don't want to use the spread operator due to browser limitations, you can consider alternative approaches: 1. Using `Array.prototype.reduce()` or other functional programming techniques to merge objects. 2. Implementing your own merge function using looping and property accessors. 3. Using a library like Underscore.js (similar to Lodash) that provides an alternative merge function. Keep in mind that the choice of approach depends on your project requirements, performance constraints, and personal preference.
Related benchmarks:
lodash.assign vs object.assign vs spread
lodash merge vs object.assign vs spread 3
Array Properties Merge: Lodash merge vs Object.assign
lodash merge vs object.assign vs spread (no intermediate vars)
lodash assign vs object.assign vs spread operator - variable and constant
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